use consistent tense

lib/liquid/standardfilters.rb

@@ -298,7 +298,12 @@ module Liquid
       end
     end
 
-    # Replace occurrences of a string with another
+    # @public_docs
+    # @syntax {{ string | replace: string, substring }}
+    # @summary Replaces all occurrences of a string with a substring.
+    # @type filter
+    # @category string
+    # @return string
     def replace(input, string, replacement = '')
       input.to_s.gsub(string.to_s, replacement.to_s)
     end
@@ -323,12 +328,22 @@ module Liquid
       output
     end
 
-    # remove a substring
+    # @public_docs
+    # @syntax {{ string | remove: string }}
+    # @summary Removes a substring.
+    # @type filter
+    # @category string
+    # @return string
     def remove(input, string)
       replace(input, string, '')
     end
 
-    # remove the first occurrences of a substring
+    # @public_docs
+    # @syntax {{ string | remove_first: string }}
+    # @summary Removes the first occurrences of a substring.
+    # @type filter
+    # @category string
+    # @return string
     def remove_first(input, string)
       replace_first(input, string, '')
     end
@@ -350,7 +365,12 @@ module Liquid
       InputIterator.new(input, context).concat(array)
     end
 
-    # prepend a string to another
+    # @public_docs
+    # @syntax {{ string | prepend: string }}
+    # @summary Prepend a string to another string.
+    # @type filter
+    # @category string
+    # @return string
     def prepend(input, string)
       string.to_s + input.to_s
     end